X-Git-Url: https://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=dgit.git;a=blobdiff_plain;f=Debian%2FDgit.pm;h=fce2ceb68ed7ef2eefdec0dec170a53c22632f99;hp=a453f352718b33a5567e040cdd9302973c40b279;hb=9c93adb7d24891e392a1a0c3ad13ccd5fb57b6f1;hpb=05532651f81d706de1fab66e8ebe97b9f646b1f9

diff --git a/Debian/Dgit.pm b/Debian/Dgit.pm
index a453f352..fce2ceb6 100644
--- a/Debian/Dgit.pm
+++ b/Debian/Dgit.pm
@@ -17,7 +17,8 @@ BEGIN {
     @ISA         = qw(Exporter);
     @EXPORT      = qw(setup_sigwarn
                       debiantag server_branch server_ref
-                      stat_exists fail ensuredir waitstatusmsg failedcmd
+                      stat_exists fail ensuredir executable_on_path
+                      waitstatusmsg failedcmd
                       cmdoutput cmdoutput_errok
                       git_rev_parse git_get_ref git_for_each_ref
                       git_for_each_tag_referring is_fast_fwd
@@ -153,6 +154,17 @@ sub ensuredir ($) {
     die "mkdir $dir: $!";
 }
 
+sub executable_on_path ($) {
+    my ($program) = @_;
+    return 1 if $program =~ m{/};
+    my @path = split /:/, ($ENV{PATH} // "/usr/local/bin:/bin:/usr/bin");
+    foreach my $pe (@path) {
+	my $here = "$pe/$program";
+	return $here if stat_exists $here && -x _;
+    }
+    return undef;
+}
+
 our @signames = split / /, $Config{sig_name};
 
 sub waitstatusmsg () {